1 x Coded Key(49mm/1.92inch) Package contains: Length*Width*Height: 13*10*5.6mm/0.51*0.39*0.22 inch The product is simply locked and still requires care to protect the information. If you have any questions, please contact me in time, I will be happy to help you solve them. When installing, take out the optical port lock, align it with the optical port of the device and push it in gently; when you hear a "click", it means that the optical port lock has locked the device interface; use the disassembly tool (Coded Keys) to align with the disassembly hole, and rotate it 90 , just pull it straight out. The USB port blocker can be used in a variety of equipment and place, and is suitable for optical fiber switches, routers, industrial computers, computers and other devices with USB optical ports. The product is a blocking cap with special insertion key made of PC material, which can protect open network ports and easily prevent users from connecting cables, devices or inserting foreign objects without permit. 10 x USB Port Blocker (Material: PC) Color: Black Our products can protect data . The elastic buckle design can effectively lock the USB optical port; at the same time, the removal tool does not distinguish between the front and the back, which can reduce operating errors; it is small and portable, can be put into your bag or pocket, and meets all your IT needs. Dustproof, moistureproof, waterproof and anti-oxidation.